Method for processing a digital image and image representation format

a digital image and image technology, applied in the field of digital image processing and image representation format, can solve the problems of not being able to handle the large storage requirement of the digital image represented in spatial domain, limited processing power of mobile phones or other handheld devices that handle images, and inability to compress

Inactive Publication Date: 2005-07-14
NOKIA TECHNOLOGLES OY
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  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

[0046] Further, the stitched image may be transferred to another image compression format, such as the JPEG format, by sequentially accessing the image blocks of the stitched image using the indicators of the image representation format, and storing the stream of Huffman-coded coefficients for sequential image blocks with zerot

Problems solved by technology

Mobile phones or other handheld devices that handle images have a limited memory space and limited processing power.
Thus, the JPEG file format is not suited for manipulation of images.
However, whe

Method used

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  • Method for processing a digital image and image representation format
  • Method for processing a digital image and image representation format
  • Method for processing a digital image and image representation format

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Embodiment Construction

[0056] In the following description, compression of images will be described with reference to JPEG-compression, although other compressions using other transforms may be contemplated. It should be noted that the scope of protection of the present invention is in no way limited to JPEG-compression.

[0057] Referring now to FIG. 1, a method for compressing a digital image will be described. Firstly, the digital image is represented in the YUV color model, step 10, wherein each pixel of the image has three components: luminance, Y, and two chromatic components U and V. The two chromatic components U and V represent color features, whose finest details are difficult to perceive for the human eye. Thus, these components may be represented in a lower resolution than the luminance component. A 16×16 pixel block of the image, which is an example of an image block as defined herein, may be represented by four Y-data units of 8×8 pixels each, one U-data unit of 8×8 pixels, and one V-data unit...

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Abstract

An image representation format for representing a digital image comprises: image information stored as a bitstream representing sequential image blocks, each block comprising one or more components, each component comprising one or more data units and each data unit being represented as a Huffman-coded stream of coefficients of basis functions, wherein a zeroth order coefficient is represented as a difference to the previous zeroth order coefficient of the corresponding component, and a block information table, which comprises: indicators to the first coefficient of a specified order of each image block in said bitstream, information indicating the number of bits in the bitstream between adjacent coefficients of said specified order of the image block, and the zeroth order coefficient of at least the first data unit of each components said zeroth order coefficient being represented in a non-differential form.

Description

TECHNICAL FIELD OF INVENTION [0001] The present invention relates to a method of processing a digital image and to an image representation format for representing a digital image. The present invention further relates to a method for encoding raw image data into a compressed digital image representation, and a method of analysing a JPEG-compressed digital image. BACKGROUND TO THE INVENTION [0002] In the society of today, enormous amounts of information are created each day. Much information is presented in the form of images. Further, large portions of the information are stored and presented electronically, for example on the Internet. Meanwhile, there is an increased usage of wireless connections to the Internet, wherein the data transfer rate is relatively low. Thus, there is a need for presenting information in a very compact form. This is especially important for images, since a normal digital image stored as an array of pixels is represented as a quite large data set. [0003] F...

Claims

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Application Information

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IPC IPC(8): G06K9/36G06T9/00H04N7/26H04N7/30
CPCH04N19/70H04N19/46H04N19/60H04N19/48H04N21/85406H04N19/93H04N21/8153H04N21/8455H04N19/40H04N1/41G06T3/00
Inventor NIEMI, SAMIJOHANSSON, KARL-ANDERSSTEN, JOHAN
Owner NOKIA TECHNOLOGLES OY
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